Melbourne, Australia, is the most livable city in the world, according to the latest annual ranking from The Economist Intelligence Unit. The ranking considers 30 factors, ranging from safety to infrastructure, across 140 cities. REUTERS/Toby Melville

Vienna, Austria. REUTERS/Herwig Prammer

Vancouver, Canada. REUTERS/Ben Nelms

Toronto, Canada. REUTERS/Mark Blinch

Calgary, Canada. REUTERS/Todd Korol

Adelaide, Australia. REUTERS/David Gray

Sydney, Australia. REUTERS/Daniel Munoz

Auckland, New Zealand. REUTERS/Stefan Wermuth

Helsinki, Finland. REUTERS/Jarno Mela/Lehtikuva

Zurich, Switzerland. REUTERS/Arnd Wiegmann